in on at

1 空间
1 On the bottle.
2 At the traffic lights.
3 On the arm.
4 On the door./In the door.
5 In Paris.
6 On the wall.
7 At the top of the stairs./At the bottom of the stairs./
8 At the gate./On the gate.
9 At the end of the queue.
10 On the beach.

2 时间
  time       at that time/at the same time
  second     in ten seconds
  minute     at ten to ten/in twenty minutes
  hour       at ten thirty/in two hours
  day        on 12 April,2016
             in the morning
             at noon
             in the afternoon
             in the evening
             at night
  week   on Tuesday/on Tuesday morning/in a week/at(on) weekend
  month      in April
  season     in spring
  year       in 2016